Allied Telesis 8100S Series - Manual (Page 117)

Stack Installation Guide for 8100S Series Switches
117
 Check that the SFP module is fully inserted in the slot.
 Verify that the operating specifications of the fiber optic ports on
the SFP transceiver and the remote network device are
compatible.
 Verify that the correct type of fiber optic cabling is being used.
 Verify that the port is connected to the correct fiber optic cable.
This is to eliminate the possibility that the port is connected to the
wrong remote network device.
 Try connecting another network device to the fiber optic port using
a different cable. If the port is able to establish a link, then the
problem is with either the cable or the other network device.
 Use the switch’s management software to verify that the port is
enabled.
 If the remote network device is a managed device, use its
management firmware to determine whether its port is enabled.
 Test the attenuation on the fiber optic cable with a fiber optic tester
to determine whether the input optical signal is too weak
(sensitivity) or too strong (maximum input power).
Problem 7: Network performance between a twisted pair port on the
switch and a network device is slow.
Solution: There might be a duplex mode mismatch between the port and
the network device. This occurs when a twisted pair port set to Auto-
Negotiation is connected to a device with a fixed duplex mode of full
duplex. If this is the cause of the problem, adjust the duplex mode of the
port on the network device or on the switch so that both ports are using the
same duplex mode.
Problem 8: The switch functions intermittently.
Solutions: Check the system hardware status through the management
software:
 Use the SHOW SYSTEM ENVIRONMENT command in the
Privileged Exec mode to verify that the input voltage from the
power source to the switch is stable and within the approved
operating range. The unit will shutdown if the input voltage
fluctuates above or below the approved operating range.
 For switches that have a ventilation fan, use the SHOW SYSTEM
ENVIRONMENT command in the Privileged Exec mode to verify
the operating status of the fan.
 Verify that the location of the switch allows for adequate airflow.
The unit will shutdown if it overheats.